In this task, you are given an article. Your task is to summarize the article in a sentence.

The proposed link would include a 3.1 mile (5km) tunnel between the Great Western main line at Slough in Berkshire and the airport's Terminal 5.
But Network Rail said a planning application, due to be submitted in the next few weeks, had been delayed until late 2017.
Businesses said the link was needed to attract more people to Reading.
Nick Halstead, who owns technology business Datasift in Green Park, said the "disappointing" delay was making it harder to attract staff.
He said: "The delay is not a good sign for this project and other projects where Reading should be seen as important."
Slough Labour MP Fiona Mactaggart said the delay showed "a failure of leadership" by the government and was "pathetic".
Tim Brownstone, who runs Reading sportswear company Kymira, said the rail link was needed to bring external investment to the area.
In November, a review of Network Rail's investment programme by Sir Peter Hendy concluded a number of projects including this one would take longer than planned.
Julian Burnell, from Network Rail, said the delay was "not really anybody's fault"  and changes had to be made following the Hendy Report.
He said: "It's a brand new tunnel, it's an entirely new stretch of railway, and that takes a lot of time and a lot of careful planning."
A Network Rail spokeswoman added consultations with landowners and interested parties in the area also had to be completed.
Given the go-ahead by the government in 2012, it was originally planned the new service would be in operation by 2021.
The plan would save up to 30 minutes for passengers travelling from south Wales, the west of England and the Thames Valley.
A delay of almost two years in building a new £500m Heathrow rail link has been criticised by businesses.

The 30-year-old Russian's 15-month ban for using meldonium ends on Wednesday when she plays in the first round.
"You have to look at how other leagues and tours have handled players who have come back," Simon told BBC Sport.
"They come right back to the team and start playing."
Italy's Roberta Vinci  - Sharapova's opponent in her comeback match on Wednesday - disagrees with the decision to invite the five-time Grand Slam champion into the main draw.
World number eight Agnieszka Radwanska, who Sharapova might have met in the second round had she not lost to Ekaterina Makarova, and former world number one Caroline Wozniacki have also questioned her presence at the tournament.
In addition to Stuttgart, Sharapova has been granted wildcards by the organisers of the events in Madrid and Rome.
She does not have a world ranking after her points expired during her suspension and would need to reach the final in Stuttgart to be eligible for French Open qualifying.
The Daily Telegraph report that Sharapova is likely to be given a wildcard into qualifying at Roland Garros rather than the tournament's main draw.
"She is starting at ground zero," Simon added.
"It is going to affect her seedings in big tournaments so she's still going to pay a penalty for a while.
"If you think about it from other leagues, most of them [bans] are half of a season or a full season. She's had a year and a half."
Former world number one Kim Clijsters echoed that view, saying that Sharapova "has done her time and her punishment".
"I was disappointed and surprised when the news came out but, having been on both sides of the spectrum as a tournament director and as a player, I don't think she needs to be punished more," the Belgian told BBC Sport.
World number five Simona Halep said: "I cannot support what the tournament director did, but also I cannot judge: it is his decision.
"In my opinion, for kids and young players, it's not OK to help with wildcards the players who were banned for doping."
BBC Sport tennis correspondent Russell Fuller
Sharapova will need to set the alarm for her first day back at work. She has scheduled a 9.15 practice session on Centre Court: it will be the first time she has been allowed inside a tournament venue since her ban took effect.
Nine hours later, she will take on Roberta Vinci. The 34-year-old has lost six of her past seven matches, and taken just four games from Sharapova in the four sets they have played. This appears to be one of the best draws the five-time Grand Slam champion could have received.
It normally takes several months for players to return to their best after such a long break: concentration and decision-making often suffer. Sharapova will, though, be brimming with motivation as she has always maintained her error was purely an administrative one.
Maria Sharapova's wildcard entry into the Stuttgart Open has been defended by WTA chief Steve Simon, who said it is in keeping with how former dopers are treated in other sports.

Security forces said 10 men were killed in an area close to an army base that was attacked on Sunday.
Fighting broke out in two different locations along the Line of Control, the disputed de facto border with Pakistan-administered Kashmir.
It comes after 10 weeks of protests in which almost 90 people have died.
Army spokesman Lt-Col Rajesh Kalia said soldiers intercepted two large groups of suspected rebels who had entered an Indian-administered area of Kashmir.
Why India needs cool heads after Kashmir attack
The attack on Sunday at the army's Uri cantonment by four gunmen, in which 18 soldiers were killed, was the deadliest against Indian security forces in Kashmir for years.
India later accused Pakistan of masterminding the attack, with Home Affairs Minister Rajnath Singh labelling the country a "terrorist state".
Pakistan denied the allegations, dismissing it as a knee-jerk response by India and a "blatant attempt" to deflect attention from human rights abuses in Kashmir.
It comes as violent protests against Indian rule in the disputed region continue, with a strict curfew imposed.
Both India and Pakistan claim all of Muslim-majority Kashmir in its entirety but only control parts of it.

Eleven people, including a soldier, have died in clashes between troops and suspected militants in Indian-administered Kashmir, the army says.

